Push-button matrix



FIG. 1 is a front elevational view of a first embodiment thereof;

FIG. 2 is a left side elevational view of a first embodiment thereof;

FIG. 3 is a right side elevational view of a first emodiment thereof;

FIG. 4 is a is a top plan view of a first embodiment thereof;

FIG. 5 is a bottom plan view of a first embodiment thereof;

FIG. 6 is a front elevational view of a second embodiment thereof;

FIG. 7 is a left side elevational view of a second embodiment thereof;

FIG. 8 is a right side elevational view of a second embodiment thereof;

FIG. 9 is a is a top plan view of a second embodiment thereof; and,

FIG. 10 is a bottom plan view of a second embodiment thereof.

The "1 "and "#" keys in FIGS. 1-5 have been shaded to represent the color blue.

The broken line showings of FIGS. 1-10 are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a push-button matrix, as shown and described. 